Abstract

DE ELORRIAGA, Elena E; KOSTADINOFF, José  and  RANIOLO, Luis A. Caracterización geofisica de la Cuenca de Quehué, provincia de La Pampa. Rev. Asoc. Geol. Argent. [online]. 2013, vol.70, n.2, pp.163-172. ISSN 0004-4822.

Quehué basin is a continuous belt of negative values of Bouguer anomalies that are located in the east of the province of La Pampa. It is very narrow and spreads along 300 km, with an orientation N35°W, from: Luan Toro in the north, through Quehué and Abramo, Laguna Colorada Grande in the south. Based on geophysical results, it is believed to be limited by major faults and that is a rift basin similar to General Levalle's. It is part of the pampeano rift system of Argentina; parallel and genetically associated to the Macachin basin. The area studied in this research includes maximum and minimum gravity of different magnitudes associated with changes in basement depth. In Quehue basin six depocenters are recognized, they vary in extension and sediment thickness. Although only the presence of Cretaceous sediments was confirmed, it is possible that initial filling of basin has begun in the Jurassic and is overlying, in part, on Paleozoic sediments. Variations in gravity and magnetic data in both sides of the basin show differences in basement composition.

Keywords : Geophysical prospection; Depocenters; Quehue Basin.

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